Java Float Keyword

by Online Tutorials Library July 22, 2022

Java float keyword

The Java float keyword is a primitive data type. It is a single-precision 32-bit IEEE 754 floating point. It is used to declare the variables and methods. It represents the fractional numbers.

Points to remember

The float covers a range from 1.40129846432481707e-45 to 3.40282346638528860e+38 (positive or negative).
Its default value is 0.0f.
Its default size is 4 byte.
It can be used to save memory in large arrays of floating point numbers.
It is not a good approach to use float for precise values, such as currency.

Examples of Java float keyword

Example 1

Let’s see a simple example to display float type variable.

  public class FloatExample1 {    public static void main(String[] args) {    float num1=5.5f;  float num2=5f;  System.out.println(“num1: “+num1);  System.out.println(“num2: “+num2);  }  }  

Output:

num1: 5.5  num2: 5.0

Example 2

In this example, we provide integer value to float variable. Here, compiler implicitly typecast integer to float and display the corresponding value in fractional form.

  public class FloatExample2 {    public static void main(String[] args) {    float num1=5;  float num2=10;  System.out.println(“num1: “+num1);  System.out.println(“num2: “+num2);  }  }  

Output:

num1: 5.0  num2: 10.0

Example 3

In this example, we provide bigger decimal value.

  public class FloatExample3 {    public static void main(String[] args) {    float num1=581216732.323433f;  float num2=7.83684987683688f;  System.out.println(“num1: “+num1);  System.out.println(“num2: “+num2);    }    }  

Output:

num1: 5.812167E8  num2: 7.8368497

Example 4

In this example, we provide float value to the decimal variable.

  public class FloatExample4 {    public static void main(String[] args) {                float num=56.34;  System.out.println(“num1: “+num);  }    }  

Output:

Exception in thread "main" java.lang.Error: Unresolved compilation problem:   Type mismatch: cannot convert from double to float

Example 5

In this example, we provide the end range of decimal value.

  public class FloatExample5 {    public static void main(String[] args) {    float num1=1.40129846432481707e-45f;  float num2=3.40282346638528860e+38f;  System.out.println(“num1: “+num1);  System.out.println(“num2: “+num2);}  }  

Output:

num1: 1.4E-45  num2: 3.4028235E38

Example 6

In this example, we provide the value in scientific notation

  public class FloatExample6 {    public static void main(String[] args) {    float num1=1873.2f;  //providing same value in scientific notation  float num2=1.8732e3f;  System.out.println(“num1: “+num1);  System.out.println(“num2: “+num2);  }    }  

Output:

num1: 1873.2  num2: 1873.2

Example 7

In this example, we create a method returning float value.

  public class FloatExample7 {    public float display(float weight)  {  return weight;  }    public static void main(String[] args) {    FloatExample7 d=new FloatExample7();  System.out.println(d.display(62.5f));  }  }  

Output:

62.5

Next TopicJava Keywords

Java Float Keyword

Java float keyword

Points to remember

Examples of Java float keyword

Example 1

Example 2

Example 3

Example 4

Example 5

Example 6

Example 7

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